Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with a first image in a sequence for an animated graphical user interface in accordance with a first embodiment;

FIG. 2 is a front view of a display screen or portion thereof with a second image in a sequence for an animated graphical user interface in accordance with the first embodiment;

FIG. 3 is a front view of a display screen or portion thereof with a first image in a sequence for an animated graphical user interface in accordance with a second embodiment; and,

FIG. 4 is a front view of a display screen or portion thereof with a second image in a sequence for an animated graphical user interface in accordance with the second embodiment.

The outermost broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The remaining broken lines, illustrating portions of the animated graphical user interface, form no part of the claimed design. The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 